Measuring device.



M. R. KONDOLP.

MEASURING DEVICE.

APPLICATION FILED NOV. 19, 1913.

1,1 1 6,079. Patented Nov. 3, 1914.

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MATHIAS R. KONIDOLF, OF ROCHESTER, NEW YORK.

MEASURING nnvion.

Specification of Letters Patent.

Application filed November 19, 1913. Serial No. 801,882.

To all whom it may concern Be it known that I, MA'rirIAs It. KoNDoLF, acitizen of the United States, residing at Rochester, in the county ofMonroe and State of New York, have invented certain new and usefulImprovements in Measuring Devices, of which the following is aspecification.

The object of this invention is to provide a measuring device that willnot only measure lengths but will also indicate any correction thatshould be made due to expansion or contraction of the measuring deviceon account of change in temperature. I This and other objects of theinvention will be fully illustrated in the drawings, described in thespecification and the end thereof.

In the drawings, Figure 1 illustrates one end of the measuringdeviceshowing the casing from which the cover and part of the indicatingdevice therein has been removed. Fig. 2 represents the other end of themeasuring device. Fig. 3 shows the cover for the casing shown in Fig. 1,the cover being partly broken away to show the indicating deviceprotected thereby. Fig. 4 is a modification of the indicating device.

In the accompanying drawings, like reference numerals indicate likeparts.

In the drawings, reference numeral 1 indicates a handle to which isattached a steel tape 2 and a brass tape 3. It will be understood thatthe tapes maybe of any other metals that will have a differentco-efiicient of expansion, steel and brass being preferred as being moresuitable forthe purpose. The steel tape is calibrated in inches or feetor in any desired way from zero up to any length that may be desired andthe brass tape may be marked with marks coinciding with the end marks onthe steel tape. The tapes and indicating mechanism will be so adjustedthat these marks would exactly agree with each other at a certainpredetermined temperature which temperature would preferably be 62, thegovernment standard.

At the opposite end of the steel tape is attached the rack 4: and to theend of the brass tape is attached the rack 5. These racks extend into acasing 6 which has a handle 7 on the end thereof. I These racks areguided in the casing by studs or antifrictionrollers 8, 9, 10 and 11 bywhich devices, the racks pointed out in the claims at are held snuglyagainst theside walls of the Patented Nov. 3, 191a.

casing, permitting the rack to slide freely along the side of thecasing.

Mounted in the casingisthestud 12 on I which is mounted to rotate thepinion 13 which meshes with the racks and 5. Also mounted inthe casingis the shaftl on which is mounted to rotate the pinion Theshaft l4 andthe pinion l5 areadapted to rotate together being mounted in. suitablehearings in the casing and the cover there for. The cover 16 is providedfor the easing, this cover having the screw holes 17 and 18 at each endthereof and having the circular raised or embossed portion 19 inthemiddle thereof. 0n the end of the shaft 14 immediately under thisembossed portion is mounted to rotate the indicating dial 20, the pinion15, the shaft 14- and the indicating dial 20 allbeing keyed together soas to rotate in unison.

Mounted on the cover is the index pointer 21 which extends into a sightopening 22 under which the rotating dial is exposed and through whichthe position of the dial will appear.

The use or operation of the measuring de I to thefact that the brasstape had shortened more than the steel tape and this rotation wouldindicate the amount that would have to be added to the rotating of thesteel tape in order to give the correct measurement. If both tapes hadlengthened, due to the increase of temperature over the standard of 162, the dial 20 would rotate in the other direction and indicate thecorrection that would have to be subtracted from the steel tape in orderto get the correct reading.

It will be understood that as the casing 6 is pulled to the right, thepinion 18 will move with it and will rotate to adjust itself to changeany length of the tapes, which rotation will stop when the pinionispulled by equal force with both tapes. This rotation of the pinionwill be communicated to the dial 20 and will indicate on the dial thecorrection that must be made in the reading of the steel tape in orderto get the correct measurement.

A large gear may be put on the shaft 14 which gear may in turncommunicate with a small pinion on which pinion or its shaft, the dial20 may be carried, thus multiplying the rotation of the dial until asufiiciently large indicationis obtained. Such a train of gears is shownin Fig. a.

I claim: 'j

1'. In a measuring device the combination of a pair of tapes, means forholding said tapes in fixedrelation at one end, a rack on the oppositeend in each of said tapes, a pinion placed between said racks, saidracks engaging the opposite sides of said pinion, a casing in which saidpinion is mounted to rotate on a fixed axis, said racks being adapted toslide on said casing and rotate the pinion or hold it balanced betweenthem.

2. In a device'for linear measurement, the combination of two longflexible tapes having different coefiicients of expansion, means locatedat the outer ends of the tapes for holding those ends of said tapes infixed relation to each other, independent means located at the innerends of the tapes for holding said inner ends in variable relation toeach other, said independent means having an indicating device, andmeans whereby said device is actuated by the movement of both tapes tocorrectly indicate the relative change of the lengths of the tapes.

3. In a device for linear measurement, the combination of tWo longflexible tapes hav ing difierent coefficients of expansion, meanslocated at the outer ends of the tapes for holding those ends of saidtapes in fixed re lation to .each other, independent means located atthe inner ends of the tapes :tor holding said inner ends of the tapes invariable relation to each other, said independent means having anindicating device, gearing between the ends of said tapes and saidindicating device whereby said device is actuated by the movement ofboth tapes to correctly indicate the relative change of the lengths ofthe tapes.

In testimony whereof I affix my signature 1n presence of two witnesses.

MATHIAS R. KONDOLF.

Witnesses:

Anion M. J oHANNs, EDNA K. BoorH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

